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How do you tell what size rotors 0n a 2015 dodge grand caravan in the rear. There are two options 305 mm and 328 mm. thank you
 

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I thought by 2014 they all had the larger brakes?
 

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Yea, I would think you have the heavy duty brakes on a 2015 as well.

FWIW, I have a 2012 DGC with standard brakes. I installed 302 mm rotors on the front and 305 mm rotors on the rear.
This was the recommended size by RockAuto.
 

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If your front brakes have dual pistons, you have the larger brakes. I think there is a comparison thread here somewhere with pictures.
 

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2013 Dodge Grand Caravan
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If you have 16" wheels you can only have the standard duty brakes (305mm). If you have 17" wheels you probably have the heavy duty brakes (328mm), unless you can fit you hand between the caliper and the wheel.

They packed as much brake as they could into the wheels, so there's not much of a gap between calipers and the wheel unless you have the 305mm rotors on 17" wheels.
 

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17" wheels were standard by then.
 
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